Let's roll up our sleeves and solve this. We have 150 and we're going to multiply it by 26, essentially adding 150 to itself 26 times.
Step 1: 0 + 150 = 150
Step 2: 150 + 150 = 300
Step 3: 300 + 150 = 450
Step 4: 450 + 150 = 600
Step 5: 600 + 150 = 750
Step 6: 750 + 150 = 900
Step 7: 900 + 150 = 1050
Step 8: 1050 + 150 = 1200
Step 9: 1200 + 150 = 1350
Step 10: 1350 + 150 = 1500
Step 11: 1500 + 150 = 1650
Step 12: 1650 + 150 = 1800
Step 13: 1800 + 150 = 1950
Step 14: 1950 + 150 = 2100
Step 15: 2100 + 150 = 2250
Step 16: 2250 + 150 = 2400
Step 17: 2400 + 150 = 2550
Step 18: 2550 + 150 = 2700
Step 19: 2700 + 150 = 2850
Step 20: 2850 + 150 = 3000
Step 21: 3000 + 150 = 3150
Step 22: 3150 + 150 = 3300
Step 23: 3300 + 150 = 3450
Step 24: 3450 + 150 = 3600
Step 25: 3600 + 150 = 3750
Step 26: 3750 + 150 = 3900

So, 150*26 = 3900